| 摘要 |
It is disclosed a light-emitting device (100) comprising a light guide (101), comprising a first (101a) and a second (101b) output surface portion. The light-emitting device (100) further comprises a plurality of light-outcoupling elements (103) and an array of beam-forming structures (104). The light-outcoupling elements (103) are positionally arranged relatively to the beam-forming structures (104) such as to enable light that is impinging on at least one of the light-outcoupling elements (103) and subsequently being incident on a surface portion of a beam-forming structure (104) to be within a predetermined angle interval with respect to the surface portion. Each of the beam-forming structures (104) is adapted to enable light leaving a surface portion of the beam-forming structure (104) to be within a predetermined angle interval with respect to the surface portion. Both direct, functional light and indirect light may be provided, an increased optical efficiency may be achieved, glare control properties of the light outputted from the light-emitting device (100) may be improved and/or the ratio of light outputted from the first surface portion (101a) of the light guide (101) to light outputted from the second surface portion (101b) of the light guide (100) may be adjusted. |
